Toothbrush



FIG. 1 is a top, front end, and side perspective view of a toothbrush showing my new design;

FIG. 2 is an elevational view of the side opposite that shown in FIG. 1;

FIG. 3 is a bottom plan view thereof; and,

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a toothbrush, as shown and described. 